In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Radical Mediated C-H Functionalization of 3,6-Dichloropyridazine: Efficient Access to Novel Tetrahydropyridopyridazines, published in 2015-05-15, which mentions a compound: 1276056-86-0, Name is tert-Butyl (6-chloropyridazin-3-yl)carbamate, Molecular C9H12ClN3O2, Computed Properties of C9H12ClN3O2.
A radical mediated C-H functionalization of 3,6-dichloropyridazine using primary alcs., t-BuOOH, and TiCl3 to access alkoxy pyridazines is described. This transformation is conducted open to air and on gram scale. A subsequent cyclization step can then be employed to efficiently access diversely substituted tetrahydropyridopyridazines, e.g., I (X-rays single crystal structure shown), with multiple functional handles.
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Reference:
Thiazolidine – Wikipedia,
Thiazolidine – ScienceDirect.com